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Finding the Fourth Proportional to 128,808.48, 177,752.96 and 71,438.56

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Solution

The fourth proportional to 128,808.48, 177,752.96 and 71,438.56 is: 98,583.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,808.48 : 177,752.96 = 71,438.56 : x
  2. Step 2: Convert to fraction form
    128,808.48/177,752.96 = 71,438.56/x
  3. Step 3: Cross multiply
    128,808.48x = 177,752.96 × 71,438.56
  4. Step 4: Simplify right side
    128,808.48x = 12,698,415,498.14
  5. Step 5: Solve for x
    x = 12,698,415,498.14/128,808.48
  6. Step 6: Final answer
    x = 98,583.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.